Magnetic silica porous adsorbent and preparation method and applications thereof

A porous adsorbent, silica technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve the problem of poor adsorption treatment selectivity, low adsorption efficiency, secondary Pollution and other problems, to achieve the effect of good selectivity, high reuse rate, cost and environmental protection

Active Publication Date: 2019-11-15
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of the existing silica magnetic adsorption material preparation process that easily produces secondary pollution, poor selectivity of adsorption treatment, and low adsorption efficiency, and provide a magnetic silica porous adsorbent. Preparation

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  • Magnetic silica porous adsorbent and preparation method and applications thereof

Examples

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Embodiment 1

[0026] A preparation method of a magnetic silicon dioxide porous adsorbent, comprising the steps of:

[0027] (1) Weigh 2.00g (0.005mol) Fe respectively 2 (SO 4 ) 3 , 1.20g (0.02mol) silica powder and 1.40g (0.005mol) FeSO 4 ·7H 2 O, whose molar concentration is higher than that of Fe 3+ :Fe 2+ :SiO2 2 =2:1:4. Fe first 2 (SO 4 ) 3 and silicon dioxide powder into 100ml of deionized water, ultrasonically dispersed for 10 minutes, then magnetically stirred until completely dissolved, the stirring temperature was 60°C, and then FeSO was added 4 ·7H 2 O was stirred for several minutes to completely dissolve the ferrous ions to obtain a mixed solution.

[0028] (2) Weigh 1.60 g of sodium hydroxide, dissolve it in 300 ml of deionized water, and control the temperature at 60° C., as the alkaline solution for the reaction.

[0029] (3) Slowly add the mixed solution in step 1 and the alkali solution in step 2, continue stirring after adding the mixed solution, adjust the pH...

Embodiment 2

[0035] A preparation method of a magnetic silicon dioxide porous adsorbent, comprising the steps of:

[0036] (1) Weigh 2.00g (0.005mol) Fe respectively 2 (SO 4 ) 3 , 1.20g (0.02mol) silica powder and 1.55g (0.0055mol) FeSO 4 ·7H 2 O, whose molar concentration is higher than that of Fe 3+ :Fe 2+ :SiO2 2 = 1.8:1:3.6. Fe 2 (SO 4 ) 3 and silicon dioxide powder into 100ml of deionized water, ultrasonically dispersed for 10min, then magnetically stirred until completely dissolved, the stirring temperature was 60°C, and then FeSO was added 4 ·7H 2 O was stirred for several minutes to completely dissolve the ferrous ions to obtain a mixed solution.

[0037] (2) Weigh 1.6 g of sodium hydroxide, dissolve it in 300 ml of deionized water, and control the temperature at 60° C., as the alkaline solution for the reaction.

[0038] (3) Slowly add the mixed solution in step 1 and the alkali solution in step 2, continue stirring after adding the mixed solution, adjust the pH to 11...

Embodiment 3

[0041] A preparation method of a magnetic silicon dioxide porous adsorbent, comprising the steps of:

[0042] (1) Weigh Fe respectively 2 (SO 4 ) 3 , silica powder and FeSO 4 ·7H 2 O, which is more molar than Fe 3+ :Fe 2+ :SiO2 2 =2:1:3. Fe 2 (SO 4 ) 3 Add silicon dioxide powder and 100ml deionized water, ultrasonically disperse for 10min, then magnetically stir until completely dissolved, stirring temperature is 70°C, then add FeSO 4 7H 2 O stirred for several minutes to completely dissolve the ferrous ions to obtain a mixed solution.

[0043] (2) Weigh 1.6 g of sodium hydroxide, dissolve it in 300 ml of deionized water, and control the temperature at 60° C., as the alkaline solution for the reaction.

[0044] (3) Slowly add the mixed solution in step 1 and the alkali solution in step 2, continue stirring after adding the mixed solution, heat, adjust the pH to 11, control the temperature at 70°C, react for 120 minutes, stop heating, After aging for 1 hour, wash ...

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Abstract

The invention discloses a magnetic silica porous adsorbent and a preparation method and applications thereof. The preparation method comprises following steps: mixing silica powder and an iron ion solution; adding a hot alkali solution with a temperature of 60 to 80 DEG C to adjust the pH; after complete reactions, cooling the solution to the room temperature, carrying out aging, washing to the product until the product becomes neutral, drying, and grinding to obtain the magnetic silica porous adsorbent. According to the preparation method, an inorganic silicon source namely silica powder is taken as the raw material, silica powder is cheap, easily-available, nontoxic, and environmentally friendly, during the preparation process, no organic waste liquid is generated, the preparation methodis environmentally friendly, a surface deposition method is adopted, one-step synthesis is performed at a low temperature, the reaction time is short, the energy consumption is low during the preparation process, and the cost is low. The magnetic silica porous adsorbent has good selectivity, the maximal methylene blue adsorption quantity is 121.23 mg / g, and the maximal malachite green adsorptionquantity is 163.52 mg / g.

Description

technical field [0001] The invention relates to the technical field of printing and dyeing wastewater treatment, more specifically, to a magnetic silica porous adsorbent and its preparation method and application. Background technique [0002] The promulgation of the "Water Ten Measures" has put forward higher requirements for water pollution control. As a type of wastewater that is difficult to treat, industrial wastewater has been closely watched, and printing and dyeing wastewater is a type of wastewater that accounts for a relatively high proportion of the total industrial wastewater discharge. Printing and dyeing wastewater has high organic concentration, large chroma, stable chemical properties, and is difficult to biochemically. It is a kind of industrial wastewater that is difficult to treat. After the physical, chemical and biochemical treatment of printing and dyeing wastewater, the pollution index is greatly reduced, and most of them can meet the discharge standar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/30B01J20/10C02F1/28C02F101/30
CPCB01J20/28009B01J20/10B01J20/28054C02F1/281C02F2101/308
Inventor 汤兵叶建文宾丽英
Owner GUANGDONG UNIV OF TECH
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